The atomic radius of potassium is smaller than the atomic radius of ________.

A) cesium

Valence electrons are electrons located

A) in the outermost energy level of an atom

One element that has 7 valence electrons is ________.

A) bromine

The number of electromagnetic waves that travel past a certain point in a given time is the ________ of the radiation.

A) frequency

A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold?

E) 19.3 g/mL

521/27

D=M(grams) / V(ML)=

A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is ________ *Note: 1kg= 35.28 oz and 1lb = 16 oz.

A) 19 mg

136oz x 1kg
---------- ------- =3.85 kg x5 = 19.27
1 35.28oz

What is the mass of 2.00 L of a solution with a density of 1.15 g/mL?

B) 2.30 kg

1.15=x/2000
d=M(g)/V(ml)

2.00 L = 2000 ml
2x1000

1.15x2=2.30 kg

How many kilojoules are required to raise the temperature of a 150. g sample of silver from
25 °C to 135 °C? Silver has a specific heat of 0.235 J/g °C.

SH = ___energy___
Mass x ∆T

C) 3.88 kJ

delta T=T2-T1=135-25

.235=Energy(J)/150x110

38.77.5J/1000= 3.8KJ

The electromagnetic spectrum is a continuum which has low energy radio waves on one end and high energy gamma rays on the other. Compared to gamma rays, radio waves have